I don't know that I would compare the two. They both achieve awesomeness in different ways, and in some ways, the same way. Both games are beautiful for sure. In Planetside, you're not always necessarily in battle but, you're always going somewhere, or doing something to hurt the enemy frontlines. Very rewarding and gives a bit more of a sense of purpose.

Battlefield is just simply awesome, especially with the release of Armored Kill in my opinion.

But in all honesty, I have been waiting for a game like Planetside2 for many, many years.. Mostly for the MMOFPS aspect. They seriously set the bar with this one. It will be interesting to see how the industry reacts, in particular, EA/DICE